Viessmann Vitocal 350-A Installation And Service Instructions Manual page 41

System example 2
Required equipment
Pos. Description
Heat source
1 Heat pump
2 Instantaneous heating water heater (accessory, with control module)
4 Heat pump control unit (with connecting cable to the heat pump)
5 Circulation pump for cylinder heating (accessory)
6 Secondary pump (accessory)
8 Safety assembly (accessory)
9 Expansion vessel (accessory)
qP Outside temperature sensor
qQ KM BUS distributor
qW
Flow temperature sensor - secondary circuit (type AWH-O: install inside the
building in the secondary circuit flow)
External heat source
wP
External heat source (e.g. Vitola 200)
wQ External heat source demand
wW Mixer motor
wE External heat source temperature sensor (system flow temperature sen-
sor)
wR High limit safety cut-out 70 °C for shutting down the external heat source (on
site)
wT High limit safety cut-out 70 °C for switching off the secondary pump (on
site)
wZ Circulation pump for DHW reheating (in conjunction with on-site immersion
heater only with additional contactor; see page 210)
wU Boiler water temperature sensor in the external heat source (connection to
the heat pump control unit)
DHW heating with a cylinder primary store
eP Cylinder
eQ Cylinder temperature sensor
eW
DHW circulation pump ("DHWcirServ")
eE Motorised two-way valve
eR Flow limiter
eT Plate heat exchanger
eZ Cylinder primary pump
(cont.)
Preparing for installation
41